Art. 110-26 begins by stating that sufficient access and working space shall be provided. This should force the designer/engineer to insure adequate space has been allowed for in the original design. But then the owners maintenance team may need the space for some other reason, valid or no.
It appears that the key words in Art. 110-26(a) is "while energized shall comply with dimensions of.....". If the motor is shut down for maintenance, then perhaps only reasonable access, no matter difficult, may be the key to such maintenance.
Perhaps this CMP should address this situation next time around.
Art. 430-12 addresses the motor terminal housing and its details, but not working clearances around it.
Art. 430-14 requires motors to be located so maintenance can be readily be accomplished.
Sorry I am late with this post.